[sdiy] lots of VCAs on one PCB

[Derek Holzer]

Howdy all,

I'm looking at building a joystick controlled 4x4 matrix mixer, which  
requires 16 VCAs when it's all added up. It would be for control  
voltage, so a linear VCA is required. I've looked at the Thomas Henry  
VCA, which is pretty simple and quite nice, but all the layouts I've  
found for it are fairly large.

It struck me that a vocoder would need approximately the same amount  
of VCAs (depending on the number of analysis/resynthesis channels of  
course), so there must be some layout someplace that has a lot of VCAs  
packed together on one PCB board.

Can anyone point me to a layout that packs so much into a fairly small  
space (one Eurocard sized PCB 100x120mm)? Or a super basic linear VCA  
schemo that could be laid out in such a way? Alternately, is there  
anyone interested in working with me to design such a thing? I'd be  
willing to invest something in getting PCBs made in this case.

Best!
Derek

-- 
::: derek holzer ::: http://blog.myspace.com/macumbista :::  
http://www.vimeo.com/macumbista :::
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"Make what's perfect more human"